oj.uz

답안 #287860

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
287860 2020-09-01T04:58:07 Z 문홍윤(#5789) Election Campaign (JOI15_election_campaign) C++17
100 / 100
 229 ms 28408 KB 
#include <bits/stdc++.h>
#define eb emplace_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;

struct FENWICK{
    LL tree[100010];
    LL sum(int i){
        LL ans=0;
        while(i){
            ans+=tree[i];
            i-=(i&-i);
        }
        return ans;
    }
    void update(int i, LL num){
        while(i<=100000){
            tree[i]+=num;
            i+=(i&-i);
        }
    }
}fen;

int n, m;
vector<int> inp[100010], link[100010];
vector<pair<pii, LL> > qu[100010];
int sz[100010], d[100010], p[100010];

void dfs1(int num, int par){
    sz[num]=1;
    p[num]=par;
    d[num]=d[par]+1;
    for(auto i:inp[num]){
        if(i==par)continue;
        dfs1(i, num);
        link[num].eb(i);
        sz[num]+=sz[i];
    }
}

int eul[100010], fin[100010], re;
int col[100010], ctp[100010], cre;
LL dp[100010];

bool cmp(int a, int b){return sz[a]>sz[b];}
void dfs2(int num, int c){
    sort(all(link[num]), cmp);
    eul[num]=fin[num]=++re;
    col[num]=c;
    for(int i=0; i<link[num].size(); i++){
        if(i){
            ctp[++cre]=link[num][i];
            dfs2(link[num][i], cre);
        }
        else dfs2(link[num][i], c);
        fin[num]=fin[link[num][i]];
    }
}
int lca(int a, int b){
    if(col[a]==col[b]){
        if(eul[a]<eul[b])return a;
        return b;
    }
    if(col[a]>col[b])swap(a, b);
    return lca(a, p[ctp[col[b]]]);
}

LL query(int num, int a, int b){
    LL ret=fen.sum(fin[num])-fen.sum(eul[num]);
    while(1){
        if(a==num)break;
        if(col[a]==col[num]){
            ret-=fen.sum(eul[a])-fen.sum(eul[num]);
            break;
        }
        ret-=fen.sum(eul[a])-fen.sum(eul[ctp[col[a]]]-1);
        a=p[ctp[col[a]]];
    }
    while(1){
        if(b==num)break;
        if(col[b]==col[num]){
            ret-=fen.sum(eul[b])-fen.sum(eul[num]);
            break;
        }
        ret-=fen.sum(eul[b])-fen.sum(eul[ctp[col[b]]]-1);
        b=p[ctp[col[b]]];
    }
    return ret;
}

void dfs3(int num){
    LL tmp=0;
    for(auto i:link[num]){
        dfs3(i);
        tmp+=dp[i];
    }
    dp[num]=tmp;
    for(auto i:qu[num]){
        LL tmp2=query(num, i.F.F, i.F.S);
        dp[num]=max(dp[num], tmp2+i.S);
    }
    fen.update(eul[num], dp[num]-tmp);
}

int main(){
    scanf("%d", &n);
    for(int i=1; i<n; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        inp[a].eb(b);
        inp[b].eb(a);
    }
    dfs1(1, 0);
    ctp[++cre]=1;
    dfs2(1, cre);
    scanf("%d", &m);
    for(int i=1; i<=m; i++){
        int a, b; LL c;
        scanf("%d %d %lld", &a, &b, &c);
        qu[lca(a, b)].eb(mp(a, b), c);
    }
    dfs3(1);
    printf("%lld", dp[1]);
}

Compilation message

election_campaign.cpp: In function 'void dfs2(int, int)':
election_campaign.cpp:55:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for(int i=0; i<link[num].size(); i++){
      |                  ~^~~~~~~~~~~~~~~~~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:111:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  111 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
election_campaign.cpp:114:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  114 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:121:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  121 |     scanf("%d", &m);
      |     ~~~~~^~~~~~~~~~
election_campaign.cpp:124:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  124 |         scanf("%d %d %lld", &a, &b, &c);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 6 ms 7552 KB Output is correct
5 Correct 116 ms 16324 KB Output is correct
6 Correct 65 ms 25336 KB Output is correct
7 Correct 105 ms 22008 KB Output is correct
8 Correct 75 ms 15736 KB Output is correct
9 Correct 105 ms 20472 KB Output is correct
10 Correct 80 ms 15812 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 5 ms 7424 KB Output is correct
3 Correct 6 ms 7552 KB Output is correct
4 Correct 127 ms 27896 KB Output is correct
5 Correct 125 ms 28280 KB Output is correct
6 Correct 125 ms 28280 KB Output is correct
7 Correct 126 ms 28280 KB Output is correct
8 Correct 123 ms 28280 KB Output is correct
9 Correct 120 ms 28408 KB Output is correct
10 Correct 120 ms 28280 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 5 ms 7424 KB Output is correct
3 Correct 6 ms 7552 KB Output is correct
4 Correct 127 ms 27896 KB Output is correct
5 Correct 125 ms 28280 KB Output is correct
6 Correct 125 ms 28280 KB Output is correct
7 Correct 126 ms 28280 KB Output is correct
8 Correct 123 ms 28280 KB Output is correct
9 Correct 120 ms 28408 KB Output is correct
10 Correct 120 ms 28280 KB Output is correct
11 Correct 16 ms 8448 KB Output is correct
12 Correct 124 ms 28280 KB Output is correct
13 Correct 134 ms 28280 KB Output is correct
14 Correct 127 ms 28408 KB Output is correct
15 Correct 132 ms 28384 KB Output is correct
16 Correct 123 ms 28408 KB Output is correct
17 Correct 129 ms 28280 KB Output is correct
18 Correct 129 ms 28280 KB Output is correct
19 Correct 131 ms 28408 KB Output is correct
20 Correct 126 ms 28364 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 219 ms 18412 KB Output is correct
2 Correct 120 ms 28024 KB Output is correct
3 Correct 182 ms 24564 KB Output is correct
4 Correct 137 ms 18288 KB Output is correct
5 Correct 178 ms 24128 KB Output is correct
6 Correct 137 ms 18068 KB Output is correct
7 Correct 179 ms 23792 KB Output is correct
8 Correct 212 ms 19064 KB Output is correct
9 Correct 128 ms 28280 KB Output is correct
10 Correct 174 ms 22760 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 6 ms 7552 KB Output is correct
5 Correct 116 ms 16324 KB Output is correct
6 Correct 65 ms 25336 KB Output is correct
7 Correct 105 ms 22008 KB Output is correct
8 Correct 75 ms 15736 KB Output is correct
9 Correct 105 ms 20472 KB Output is correct
10 Correct 80 ms 15812 KB Output is correct
11 Correct 6 ms 7552 KB Output is correct
12 Correct 7 ms 7680 KB Output is correct
13 Correct 6 ms 7552 KB Output is correct
14 Correct 6 ms 7552 KB Output is correct
15 Correct 7 ms 7552 KB Output is correct
16 Correct 6 ms 7552 KB Output is correct
17 Correct 6 ms 7552 KB Output is correct
18 Correct 6 ms 7552 KB Output is correct
19 Correct 6 ms 7552 KB Output is correct
20 Correct 6 ms 7680 KB Output is correct

Subtask #6
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 6 ms 7552 KB Output is correct
5 Correct 116 ms 16324 KB Output is correct
6 Correct 65 ms 25336 KB Output is correct
7 Correct 105 ms 22008 KB Output is correct
8 Correct 75 ms 15736 KB Output is correct
9 Correct 105 ms 20472 KB Output is correct
10 Correct 80 ms 15812 KB Output is correct
11 Correct 6 ms 7424 KB Output is correct
12 Correct 5 ms 7424 KB Output is correct
13 Correct 6 ms 7552 KB Output is correct
14 Correct 127 ms 27896 KB Output is correct
15 Correct 125 ms 28280 KB Output is correct
16 Correct 125 ms 28280 KB Output is correct
17 Correct 126 ms 28280 KB Output is correct
18 Correct 123 ms 28280 KB Output is correct
19 Correct 120 ms 28408 KB Output is correct
20 Correct 120 ms 28280 KB Output is correct
21 Correct 16 ms 8448 KB Output is correct
22 Correct 124 ms 28280 KB Output is correct
23 Correct 134 ms 28280 KB Output is correct
24 Correct 127 ms 28408 KB Output is correct
25 Correct 132 ms 28384 KB Output is correct
26 Correct 123 ms 28408 KB Output is correct
27 Correct 129 ms 28280 KB Output is correct
28 Correct 129 ms 28280 KB Output is correct
29 Correct 131 ms 28408 KB Output is correct
30 Correct 126 ms 28364 KB Output is correct
31 Correct 219 ms 18412 KB Output is correct
32 Correct 120 ms 28024 KB Output is correct
33 Correct 182 ms 24564 KB Output is correct
34 Correct 137 ms 18288 KB Output is correct
35 Correct 178 ms 24128 KB Output is correct
36 Correct 137 ms 18068 KB Output is correct
37 Correct 179 ms 23792 KB Output is correct
38 Correct 212 ms 19064 KB Output is correct
39 Correct 128 ms 28280 KB Output is correct
40 Correct 174 ms 22760 KB Output is correct
41 Correct 6 ms 7552 KB Output is correct
42 Correct 7 ms 7680 KB Output is correct
43 Correct 6 ms 7552 KB Output is correct
44 Correct 6 ms 7552 KB Output is correct
45 Correct 7 ms 7552 KB Output is correct
46 Correct 6 ms 7552 KB Output is correct
47 Correct 6 ms 7552 KB Output is correct
48 Correct 6 ms 7552 KB Output is correct
49 Correct 6 ms 7552 KB Output is correct
50 Correct 6 ms 7680 KB Output is correct
51 Correct 211 ms 19132 KB Output is correct
52 Correct 128 ms 28280 KB Output is correct
53 Correct 188 ms 22892 KB Output is correct
54 Correct 140 ms 18160 KB Output is correct
55 Correct 224 ms 18796 KB Output is correct
56 Correct 129 ms 28340 KB Output is correct
57 Correct 192 ms 23540 KB Output is correct
58 Correct 139 ms 18280 KB Output is correct
59 Correct 208 ms 19056 KB Output is correct
60 Correct 128 ms 28280 KB Output is correct
61 Correct 180 ms 23796 KB Output is correct
62 Correct 142 ms 17844 KB Output is correct
63 Correct 218 ms 18424 KB Output is correct
64 Correct 126 ms 28280 KB Output is correct
65 Correct 180 ms 23528 KB Output is correct
66 Correct 143 ms 18024 KB Output is correct
67 Correct 229 ms 18660 KB Output is correct
68 Correct 126 ms 28280 KB Output is correct
69 Correct 178 ms 22428 KB Output is correct
70 Correct 140 ms 17944 KB Output is correct